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How CVE-2025-5235 Works
The OpenSheetMusicDisplay plugin (≤1.4.0) fails to sanitize the `className` parameter, allowing authenticated attackers (Contributor+) to inject malicious JavaScript. When a victim views a compromised page, the payload executes in their browser, enabling session hijacking, defacement, or malware delivery. The vulnerability stems from improper output escaping in the frontend rendering logic, where user-supplied `className` values are directly embedded in the DOM without validation.
DailyCVE Form:
Platform: WordPress Plugin
Version: ≤1.4.0
Vulnerability: Stored XSS
Severity: Critical
Date: 2025-06-04
Prediction: Patch by 2025-07-15
What Undercode Say:
Exploitation:
// Proof-of-Concept XSS via className
fetch('/wp-json/osmd/v1/save', {
method: 'POST',
body: JSON.stringify({
className: '"><script>alert(document.cookie)</script>'
})
});
Mitigation:
1. Temporary Fix:
// Add input sanitization in theme's functions.php
add_filter('osmd_classname', 'esc_attr');
2. Detection:
Grep for vulnerable code grep -r "className.=" /var/www/html/wp-content/plugins/open-sheet-music-display/
3. WAF Rule:
location ~ /wp-content/plugins/open-sheet-music-display/ {
deny if ($args ~ "className.script");
}
4. Patch Verification:
Check plugin version wp plugin get open-sheet-music-display --field=version
5. Post-Exploit Analysis:
-- Audit database for malicious entries SELECT FROM wp_posts WHERE post_content LIKE '%<script%';
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
